19 Then came the disciples to Iesus apart, and said, Why could not we cast him out?
Matthew 17:19 Cross References - Geneva
Mark 4:10
10 And whe he was alone, they that were about him with the twelue, asked him of ye parable.
Mark 9:28
28 And when hee was come into the house, his disciples asked him secretly, Why could not we cast him out?